In C++11 there is a new header called cstdint. It defines new types that are guaranteed to be of a certain size. See http://www.cplusplus.com/reference/cstdint/

Unfortunately, even if I include the header cstdint, or its C counterpart, stdint.h, Qt Creator doesn't offer uint32_t or similar types in autocompletion, nor does it highlight them like other types.

NOTE: it does offer "u_int32_t" but I have no idea where that comes from.